Datalogic DS8100A Reference Manual

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Datalogic DS8100A Reference Manual Manual pdf 69 page image

TYPICAL LAYOUTS5577 TYPICAL LAYOUTSDS8100A scanners are mainly designed to work together on a high performance Lonworkssub-network to create multi-sided and omnidirectional reading stations that can interface withSerial or Fieldbus Host networks. This chapter covers the most common Lonworks layouts.DS8100A scanners can however, be connected in a variety of layouts depending on thenumber of scanners used and the required complexity of the reading station. Layouts rangefrom single Stand Alone to complex alternative networks when Lonworks is not available forall readers (mixed reader networks). For alternative layouts see appendix A.Several power supplies are available to power the reading stations.Photoelectric sensors used as code presence sensors and optical encoders to signalconveyor speed are also available accessories.The following typical layouts refer to the system hardware configurations, but they alsorequire the correct setup of the software configuration parameters (see par. 8.2 for details).The accessories and cables indicated in the following figures are Datalogic products. Wesuggest their use to guarantee the correct system functioning.7.1 LOCAL LONWORKS NETWORKA local Lonworks network allows logically connecting a DS8100A master reader with up to 31DS8100A slaves. Actually, the maximum number of readers to be employed in the networkdepends on the system operating conditions, that is adopted operating mode and amount ofdata stream.When creating your network, always keep in mind the following guidelines:the Lonworks network logically supports a maximum number of 32 devices (master +slaves);it is recommended to adhere to the 8-in-16 rule (not more than 8 devices in any 16 meterbus segment (branch);for DS8100A scanners the total bus length may extend up to 65 m (213 ft);the maximum number of DS8100A readers supported also depends on the type of powerpropagation adopted by the system (see the specific power supply installation manual fordetails).Typically the layouts can be divided into Synchronized (single P.S.) or Multidata (multi P.S.)networks. They can be small (up to 10 scanners) or large (more than 10 scanners).Contact Datalogic Automation S.r.l., if your network requires a higher number of readers or incase the application throughput is very high.For further information on Lonworks network cabling and connections see the “LonWorks®TPT Twisted Pair Transceiver Module User’s Guide”, available from the website:www.echelon.com.